linux系统下 bonding 负载均衡 bond_mode参数说明

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linux系统下bond mode参数说明:(mode=4 在交换机支持LACP时推荐使用,其能提供更好的性能和稳定性)
          0-轮询模式,所绑定的网卡会针对访问以轮询算法进行平分。
          1-高可用模式,运行时只使用一个网卡,其余网卡作为备份,在负载不超过单块网卡带宽或压力时建议使用。
          2-基于HASH算法的负载均衡模式,网卡的分流按照xmit_hash_policy的TCP协议层设置来进行HASH计算分流,使各种不同处理来源的访问都尽量在同一个网卡上进行处理。
          3-广播模式,所有被绑定的网卡都将得到相同的数据,一般用于十分特殊的网络需求,如需要对两个互相没有连接的交换机发送相同的数据。
          4-802.3ab负载均衡模式,要求交换机也支持802.3ab模式,理论上服务器及交换机都支持此模式时,网卡带宽最高可以翻倍(如从1Gbps翻到2Gbps)
          5-适配器输出负载均衡模式,输出的数据会通过所有被绑定的网卡输出,接收数据时则只选定其中一块网卡。如果正在用于接收数据的网卡发生故障,则由其他网卡接管,要求所用的网卡及网卡驱动可通过ethtool命令得到speed信息。
          6-适配器输入/输出负载均衡模式,在”模式5″的基础上,在接收数据的同时实现负载均衡,除要求ethtool命令可得到speed信息外,还要求支持对网卡MAC地址的动态修改功能。

 

Descriptions of bonding modes
    Mode 0
        balance-rr
Round-robin policy: Transmit packets in sequential order from the first available slave through the last. This mode provides load balancing and fault tolerance.
    Mode 1
        active-backup
Active-backup policy: Only one slave in the bond is active. A different slave becomes active if, and only if, the active slave fails. The bond's MAC address is externally visible on only one port (network adapter) to avoid confusing the switch. This mode provides fault tolerance. The primary option affects the behavior of this mode.
    Mode 2
        balance-xor
XOR policy: Transmit based on selectable hashing algorithm. The default policy is a simple source+destination MAC address algorithm. Alternate transmit policies may be selected via the xmit_hash_policy option, described below. This mode provides load balancing and fault tolerance.
    Mode 3
        broadcast
Broadcast policy: transmits everything on all slave interfaces. This mode provides fault tolerance.
    Mode 4
        802.3ad
IEEE 802.3ad Dynamic link aggregation. Creates aggregation groups that share the same speed and duplex settings. Utilizes all slaves in the active aggregator according to the 802.3ad specification.
    • Prerequisites:
        1. Ethtool support in the base drivers for retrieving the speed and duplex of each slave.
        2. A switch that supports IEEE 802.3ad Dynamic link aggregation. Most switches will require some type of configuration to enable 802.3ad mode.
    Mode 5
        balance-tlb
Adaptive transmit load balancing: channel bonding that does not require any special switch support. The outgoing traffic is distributed according to the current load (computed relative to the speed) on each slave. Incoming traffic is received by the current slave. If the receiving slave fails, another slave takes over the MAC address of the failed receiving slave.
    • Prerequisites:
        ○ Ethtool support in the base drivers for retrieving the speed of each slave.
    Mode 6
        balance-alb
Adaptive load balancing: includes balance-tlb plus receive load balancing (rlb) for IPV4 traffic, and does not require any special switch support. The receive load balancing is achieved by ARP negotiation. The bonding driver intercepts the ARP Replies sent by the local system on their way out and overwrites the source hardware address with the unique hardware address of one of the slaves in the bond such that different peers use different hardware addresses for the server.

来源:https://help.ubuntu.com/community/UbuntuBonding